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Table I.

Internalization of the Salmonella Gallinarum wild type and lon, cpxR, and lon/cpxR mutants in the chicken abdominal macrophages determined by the gentamicin protection assay.

Strain Genotype Internalization (Log10 cfu/mL) a
JOL394 Wild type 3.32 ± 0.03
JOL914 Δlon 4.05 ± 0.02 b
JOL915 ΔcpxR 3.07 ± 0.09 c
JOL916 ΔlonΔcpxR 3.81 ± 0.03b

Number of intracellular bacteria in chicken abdominal macrophage after exposure with m.o.i. of 10 for 60 min and killing of extracellular bacteria by gentamicin for 30 min (mean ± SEM).


Significant difference between JOL394 (p < 0.001).


Not significant difference between JOL394 (p = 0.057).